package collection;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;

public class CollectionDemo2 {
    public static void main(String[] args) {
        Collection c=new ArrayList();
       // Collection c=new HashSet();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,10));
        c.add(new Point(3,4));

        System.out.println(c);

        Point p=new Point(1,2);
        c.add(p);//Point不重写equals则可以存入Set集合,重写了则无法存入
        System.out.println(c);
        /*
        contains:包含
        boolean contains(Object o)
         */
        Point p2=new Point(3,4);
        boolean contains=c.contains(p2);
        System.out.println("包含:"+contains);

        /*
        remove : 删除
        boolean remove(Object o)

         */
        c.remove(p2);
        System.out.println(c);
    }
}
